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MAX5079 - ORing MOSFET Controller

Description

The MAX5079 ORing MOSFET controller replaces ORing diodes in high-reliability redundant, parallel-connected power supplies.

Despite their low forward-voltage drop, ORing Schottky diodes cause excessive power dissipation at high currents.

Features

  • include an OVP flag to facilitate shutdown of a failed power supply due to an overvoltage condition, and a PGOOD signal that indicates if VIN is either below the undervoltage lockout or VBUS is in an overvoltage condition. The MAX5079 operates over the -40°C to +85°C temperature range and is available in a space-saving 14-pin TSSOP package.
  • 2.75V to 13.2V Input ORing Voltage.
  • 1V to 13.2V Input ORing Voltage with 2.75V Aux Voltage Present.
  • 2A MOSFET Gate Pulldown Curre.

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Datasheet preview – MAX5079

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Full PDF Text Transcription

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19-3584; Rev 0; 2/05 www.DataSheet4U.com ORing MOSFET Controller with Ultra-Fast 200ns Turn-Off General Description The MAX5079 ORing MOSFET controller replaces ORing diodes in high-reliability redundant, parallel-connected power supplies. Despite their low forward-voltage drop, ORing Schottky diodes cause excessive power dissipation at high currents. The MAX5079 allows for the use of low-on-resistance n-channel power MOSFETs to replace the Schottky diodes. This results in low power dissipation, smaller size, and elimination of heatsinks in high-power applications. The MAX5079 operates from 2.75V to 13.2V and includes a charge pump to drive the high-side n-channel MOSFET. Operation down to 1V is possible if an auxiliary voltage of at least 2.75V is available.
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